Sounding signal device



I Y 3i', 1939,

R. m. cRlTcHr-*aLmjf-E'-AL SOUNDING SIGNAL DEVCE Filed April 19, 1934 L l l 3 l WL* "Ln:

2 Sheets-Sheei. l

2,4 6% .37 #6, i? 20 2%.' J3'. /3 22dn v i VENGT",

r ATTORNEY Jan. 3l, 1939. R, M. CRITCHFIELD ET AL 2,145,711

SOUNDINQ SIGNAL DEVICE 2 Sheets-Sheet 2 Filed April 19, 1934 atente Jam. Sits TME@ TET GFFE SGUNDING SIGNA: DEVIGE Hebert M. chfeld and .ee White, Anlersim, 1mi., rs to General Motors Corporation, Betroit, Mich., a. corporation of Delaware Application Apri! 19. 1934, Serial Nn. 731,263

6 Ciams.

This invention relates to sound signal devices and especially to horns im' automotive vehicles, wherein a diaphragm is electro-magnetically ectuated to operate the hem. @ne ci the objects cf the present intenti@ is te lifetime e .remind sig nel this ee-eeeimg en imcleue ammini?, ef vcume.

t mtie eiiject ig te stmciiy cemstmeticn as weit ee the meen@ and meti-e et epeietitm et' .semi/:T1 eignet devices, "whereby mit ziet only be eecmemice censtmeticm eieeiemt quie" v me@ t ie actitateczi en e ce im ,i ietimeten etwaige, dep tent mi ite epcietizm am. the i'esiii. mcy cemczaeiit e am eceerepiiehei by cene' meting c amandine fieeee ei the t Je menne? ccmzieseion mami-zei ermee m mmet mzmiietimg ceiemi e @temi impeivicm in seeiefi eietieii theii peripheries. Titiceeu thi-Lie `ai. similari? cciiei" is i; -e seeet type eceet for threaten the time the @mienten m -z eeepei'ating with. the te tice ferme magnet 52E-H2@ fiiediy cem esten. fr cc'cteet fcit the centei c-itieie ci @le a. sie .time The cenetueticzr. erieugeme the perte and the eiectica eireuits within which they cperete, 'are ee feeigeeti that whe@ time of the magnet mctci ere comecteii with the cui rent enui'ce, that each the magnet Wii be energized in eitemete eed rapiti meneseicii with :respect te the utile? magnet winding so that the mevabie ermetuxe emzeet te eet upon the diaphragm pcsritiveiy mitin@ it eitemetely te .and imm the cccpemtimg zeiler surface. This to cmi im movement of the diaphragm it?, relation te the iuztepcsed cellar, met sqeeezee eut eti ef the cir iti the ccmpeesicii chamrei ecetted be tween the diepiireggm and ceiiar, and then viclewe with e iinei stepping et the stia" ccumsc message the prei-eiste? the tee @imam and 32 te mere on the retraction movement pulls the diaphragm away from the cellar to enlarge the chambei" and thereby draw air through the projector to ii the space. A construction of this type, end after this pmnciziieP remite in a sounding signal ievce cher ectezisticaiy pme in sound product of e viemt ing wir colmi/.m that is substantially free el vier/e 'tiene cemeii icy any mechanical neige. Alec, Af': r ei:- impeiiimg member is positively driven timing; l beth me eemjcees'lcm stroke and the retmetieti stecke, aimee movement eri the diephmm ci" it pellet ci 'my miemeui magnet met 1:?, iethef tine-ti em? inherent iesiliemcy cf th pirgm the armature Bemanning With the aimee @bjc-,cts in vewf'wthe immette?. resides im teese mevei feetiiifes ci censtriieti eembineteti eind ci Wm ice hefemftei: i st fiiiiv be speciiceiiy peinte-5i eelt theeppeneieci reference Iced te tice acenipanyng aiewiihietmtiiigg e prefeireti and prestiti@ ist@ chviciesly the @my @entice iimther ecjects advantages cf the mee-eet inventieie mit be emparent rem the feiowiiig de scziptimi, reference being had tc the eccempeny ing drawings Wiieiein preferied embodiment ci the @meent imveiitiem is eieerif shewii.

i mi emi View ef sound signe! device embodying the present invention, e tiieieef breitere exile-3 im" eisernes-s, the view eer' teken substentaly en me wi ci Fig. 2.

Fig. 2 is et vertical sectiemei View teken sub etentieily cri im@ wie. i, but showing :35 ci* ciiemt breaker in eievetieam me'. 3 e, 'regmemteg.; eevetieziei View Kfig. diagram mi e v tem im Gperetiiag etrce.

liike umts; 'cy the seme reference emi-rect?? thmtigiout the difeent meer.

Reife? te t) e examines, numeral indi, categ e hepimgm in; atteeiied et its peip'e ery betr yeen engaging faces of e easing 2i and a. eolici' 2f by screws 23. The eolienu also supports e wcjectei' trumpet 2t, the coliar having en aperture 22a. centrally diepcsed and opening into the' tee es? the projector. The ziaphragm end collez' relation ie ene of specic characteristics, in that it is desired that the coiar face opposing' the diaph'agm shall be very closely mating in surface contour therewith, and only slightly spaced therefrom. In practice tile diaphragm 2.@ eencentrlcelly eerz'ugated es iliustrated in the section of et it md it, which receives the diaphragm into c structure ei somewhat stiene; characteristics throughout its greater; central portiom ansi tends loeaii'ze the efrig tion in e region indicated `et 52 just within the v lmost and designated to merge smoothly into the bore of the aperture 22a. When the collar and diaphragm so characterized are assembled in their operative position, as illustrated in Fig. 2, then they will define a compression chamber it thatl is existent between andcoextensivexthroughout thecooperatlng opposed surfaces ofA the' diaphragm and collar, and the cross-sectional magnitude oithis chamber will slowly'and gradually increase from the peripheral attaching portion inwardlyto the trumpet toe, or until the chamber opens into the collar aperture 22a. The diaphragm supports at its .central portlon'one end of an axiallymovable armaturerod 2l 'having a threaded portion I6 for the accommodation ci clamping washers 21 and 2l and a nut I! which securely clamps the rod and diaphragm in assembled relation against a spacing sleeve surrounding a reduced portion Il ot the rod 25. Mounted upon an enlarged portion I2 ci the rod 25 there is an armature I3 provided with a washer 34 for engagement with. a shoulder di of-'sleeve 3U. vAn armature guide spring I9 is secured at its extremities between `members 31 and 8l and the casing 2l by screws 39. At its central portion the spring Il is clamped between washers and 4I, bearing against a spacing sleeve 42 surrounding enlarged portion 32 of the rod 25 and the other end ci' the sleeve bearing against a washer 43V of the armature A nut 44 tightened upon a threaded portion 4I ofv the rodl t'iirmly clamps the amature guide spring 3B and therod' in l assembled relation.

Two electro-magnets 48 and 41 are located one on each side of the armature 3l. and are composed of iield frames 48 and 49 carrying field windings 'l0 and 5i respectively. Bracket or shelf members 48a and 49a attach the neld trames to casing 2i in any desired manner. Appropriate electrical connections 'are made between the coils with a source ol energy and with circuit breaker mechanisms 52 and 53. These mechanisms are carried by strips 54 and 85 respectively, both being secured by screws 56 through bridging inembers 51 and 6 3 and driven into the casing 2l of the horn.

The circuit breaker mechanisms include movable contacts 59 and 60 mounted upon resilient members 8l and 62 respectively. the free ends of which overlap an engaging member 63 mounted upon the threaded portion 45 of the armature rod. Insulators lilo and 62o overlap the iinem-- bers 6i and 82 and extend between them and the engaging member 62 so that the mechanisms may be ,properly'insulated 'nie engaging member is heldv in flxed relation on vthe rod by ad instable clamping means comprising a nut 64 and washer 65 on one side and on vthc Opposite side by a nut 66 and washer B1.

Rigid brackets 68 and 69 support adju-Sting screws 10 and 1I for adiu'sting engagement with bridging members Bland 58. AFilled contact supporting members. and 13,- are provided, and

are rigidly secured to the brackets 88 and I9, and are consequently adjustable therewith. Stationary contacts 12a and 13a are mounted on the members for cooperation with the contacts 59 and 6i). The wholebreaker mechanism assembly is. secured together byrlvets 1li and 1,5.-that fasten' the assemblies to 'an intenndlateprt of the strips 54 and 55, whereby a yielding support is provided.

Referring to Fig. 4, the electrical connections are madebetween the magnet windings' and 5| and `their respective circuit breaker mechanisms by means of elements 18 land 11 communieating with leaf springs 6I and 62, whereupon optionally separable circuits are completed to ground through the contacts 59 and '12a and 'member 12 for thecircuit breaker unit 52, and

through the contacts and 13a and member 13 for the circuit breaker unit I3. With respect to each unit, a resistance element 18 is joined to the conductors 18 and 'i1 and the members 12 and 13 from whence connection is made to ground at 19, through appropriate ground leads 80, the

'provide for electrical'connection with a common conductor 83v joined to av contact 84 of an operating switch vthat provides a bridging' member 85 for connecting .the windings with a battery 86 grounded at 81 by bridging the contact 84 with the battery contact 8B. 'I'he connection to one ofthe magnet windings, for instance that designated I0, is made as short and as direct as possibleto the source, which is accomplished by 'a short lead 8l.

For purposes of accomplishing assurance of starting of the horn, or for setting the same into oscillation; a lag vdevice is inserted in the electrical circuit of the opposing electromagnet winding. One form of such lag device is illustrated in Fig.

4, and comprises a relay winding 90' having a ground connection at 9i, and is electrically connested with a resilient Contact support 82 whose electrical connection is a source of current by 'a portion of the lead 82 designated at 82a. The' lead S2 of the winding 5i is attached to a fixed contact 93 in opposed and separable relation with a movable contact 94 carried by thev member S2. Immersed in the field ofv the winding 90 there is a core member gli so disposed as to act upon the contact support 82.

With respect to the circuit diagram. when the signal device is at yrest or is non-operative. the contributing parts will besubstantialiy. as illus'- traten,r in which the horngbutton contacta will be open, both sets of circuit breaker contacts will be closed, Vand the separable contacts of the cur- Arent lag device will be open. Upon closing of the ,horn button contacts, the current from the battery 88 will traverse both of the parallel branches, in one instance going directly thruthe magnet winding and circuit breaker points to the return circuit connection,v and in the other instance going thru, the 'current lag device and thence to the return circuit connection. The open condition of vthese contacts of the current lagdevice. and their inherent resistance towards closing, will cause delayed conditions of operation in the magnet winding of that branch. by reason of which the electro-magnet winding directly con nested with the .current source.v will `be energized and draw' over the 'armaturejli'bciore the cp-l if@ posing electro-magnet can in point 1of time be energized.

In theory, the same period ci time oi' operation exists for the winding of the current lag device, as of the winding for the electro-magnet in the parallel branch, so that no magnetic iniluence is set up in the winding of the electro-magnet connected into the circuit of the lag device, until after the opposing electro-magnet has substantially completed its function. Operation of the directly connected electro-magnet, and drawing over of the armature, causes the separation of the contacts of the respective circuit-breaker mechanism, whereupon that electro-magnet will be deenerglzed. The other set of circuit breaker contacts remaining closed, and the current lag device having operatively closed the separable contacts of that device, the indirectly connected electro-magnetic winding will then be energized and operate to draw the armature in a reverse direction until it opens the circuit breaker contacts connected therewith. Once the armature.

of the device is set into operation it will continue so long as the horn button contacts are closed, the alternate energization of the opposed electromagnets being taken care oi entirely by the normally closed circuit breaker mechanism and the movable amature actuating the same.

From the foregoing description, taken in connection with the accompanying drawings. it is 'thought the construction, operation and advantage of the invention will be readily apparent to those skilled in the art to which the invention appertains.

While the embodiment o! the present invention as herein disclosed, constitutes -a preferred form, it is to be understood that lother forms might-be adopted, all coming within the scope of the claims which follow.

What is claimeclis as follows:

1. An electrical system for a sounding signal, comprising in combination, a pair of .opposed electro-magnets, an armature assembly having portions projecting through land' beyond the magnets, normally closed circuit breakers eschincircuit with an electro-magnet and disposed for engagement by a projecting portion. of the amature assembly during 'opposite movement thereof, a current source, means connectingthe source with the l electro-magnets in parallel branches, and means vdelaying the action of one electro-magnet whereby the sounding signal may be set into operationA by vthe other electro-magnet, saidl delaying means comprising` a relay having a winding directly connected between thev source and ground, and` a cooperating armature for connecting one of the electromagnetsdirectly with the source. y o

2. An electrical system for a sounding 81311.51, comprising in combination, a paire! opposed electro-magnet, an interposed armature assembly, normally closed' circuit breakers each vin circuit with an electro-magnet and positioned to be opened on opposite movement of the arma- -ture assembly, a current source, means connecting the source with the electro-magnets in'parallel branches for substantially simultaneous'energization, and means connected into one of the parallel branches to increase its reluctance for delaying the eiective action ot the electro-magnet in that branch until after the other electromagnet has been energized, the action of each electro-magnet opening the respective circuit breaker, whereby the other electro-magnet is energizable for operation. 'v

' 3. An electrical system for a sounding signal, comprising in combination, a pair of opposed electro-magnets. normally closed circuit breakers each in circuit with an electro-magnet, means for opening each circuit breaker after energizaticn of its respective electro-magnet, in-

cluding an armature assembly disposed between the electro-magnets and engaging a part of each circuit breaker, a current source, means simultaneously connecting the source with both electro-magnets in parallel branches, and means increasing the reluctance of one branch for startingthe electro-magnet of the other branch in advance of the operation of the electromagnet Vofthe same branch comprising, a relay in one oi the said branches forv delaying the energizetion of the electro-magnet in that branch until the electro-magnet in the other branch has been series with each electro-magnet, and having a pair oi normally closed contacts, responsive to the ,operation of each electro-magnet for opening its respective circuit breaker, vand means in circuit with one of the electro-magnets delaying its effective operation until the otherelectro- 'magnetbas substantially completed its function,

said delaying means comprisingv a device for increasing the magnetic resistance through the associatedel'ectromagnet.

5. An electrical system for a sounding signal, comprising invcombination, a' pair of opposed electro-magnets, .an amature assembly responding lto both electro-magnets, a circuit breaker mechanism in series with each electro-magnet, having a pair of normally closed contacts adapted to be opened upon reverse movement of the armature assembly, a current source, means connecting each circuit breaker with its respective electro-magnet into parallel branches, and the branches to the current source, and a starting device connected into one of the branches for delaying the action of the magnet in that branch until the magnet in the other branch has been operated, said starting device comprising a winding and an armature serially connected directly hetgeen the source and one of the electromagne A.

-6. An electrical system for a sounding signal, comprising in combination, a pair of opposed electro-magnets, a current source, means connecting the source simultaneously with the electro-magnets in parallel branches, a circuit breaker mechanism in series with each electro-magnet, and having a pair of normally closed contacts, means including an armature assembly responding to the influence of both magnets for opening each pair of contacts upon actuation of the respective electro-magnet, and means traversed by current .in one of the branches for delaying the eilect of the magnet in that branch upon the armature until after the magnet in the other branch has actuated the armature.

nosna'r M. comme. Joa

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